Disk plow



GLLHOFFMAN.

DISK PLOW. APPLICATION FILED SEPT. 19. 1911.

Patented N 0v. 4, 1919.

Tm: COLUMBIA PLAN6uYik$H cn, WASHINGTON, n. c.

UNI E STAT GEORGE L. HOFFMAN, OF PLAINVIEW, TEXAS.

DISK PLOW.

. 132mm. Specification of To all whom it may concern.

Be it known that I, GEORGE L. HorFMAN, a citizen of the United States, residing at Plainview, Texas, have invented a new and useful Improvement in Disk Plows, of which the following is a specification.

My invention relates to disk plows having soil turning disks, and the objects of my improvements are to so form the turning disk asto give it flexibility during action and permit a longer portion of its edge to contact with the face of the cutting disk and under a yielding pressure; to form the turning disk so that it becomes self sharpened by contact with the fa-ce of the cutting disk; to form the turningdisk for automatically releasing the accumulated trashl These objects together with others which maybe incorporated in the claims may be attained in the following described manner as illustrated in the accompanying drawings, in which: i A M Figure 1 is the plan of a disk plow provided with my improvements; Fig. '2 a front elevation with parts in vertical sec tion through the axial plane of the respective disks; Figs. 3 and 4. a front elevation and diametrical. section respectively of the sectional soil turning disk, and Fig. 5 a de tail showing an adjustment of the bracket with the turning disk in the plane of the cutting disk.

In the drawings, 1 represents the beam of a disk plow, 2 the concavo-convex cutting disk, 3 the hitch, 4 the land wheel, 5 and 6 respective front and rear furrow wheels, and 7 the seat, all being constructed and arranged in the ordinarv manner.

The arm 8 formed on the bearing 9 and thereby secured to the beam is curved parallel with the adjacent surface of the cutting diskjournaled in said bearing, and the similarly curved standard 11 is formed with the slot 12 whereby it may be extensibly secured on said arm by means of the bolts 13. The angular bracket .14 formed with the slot 15 and with the transverse fulcrum 16 may be secured on the standard by means of the clamping bolt 17 whereon it is also pivotally adjustable as shown in Fig. 5. The set screws 18 serve to adjust the bracket in different vertical angles to the adjacent face of the standard on the fulcrum 16 as shown in Fig. 2. The bifurcated yoke 21 secured on the bracket by means of the bolt 22 being inserted through the slot 15 is thereby ad- Letters Patent. Patented Nov. 4, 1919.

Application filed September 19, 1917. Serial No. 192.073.

j ustable longitudinally in said slot and also rotatively on said bolt. The soil turning disk 23 preferably concavo-convex in form is secured on the axial shaft 2-1 by means of the nut 25. Said shaft is journaled at its ends in the respective legs of the yoke 21 as shown in Fig. 2. The double bearings for said shaft serve to maintain the disk thereon in adjusted position to turn in the yoke in the proper plane even if the bearings do become worn, which is not possible where a rear bearing only is used.

' The metal wire brush 26 may be adjustably secured on the yoke as shown in Fig. 2 for automatically cleaning the face of the turningdisk from any accumulation of trash or soil thereon. The turning disk 23 may consist of a series of radiating sections 30 of thin resilient metal secured to their common hub 27 by means of the respective screws 28 as shown in Figs. 3 and 4. The adjacent edges of said sections may be cut away from a short distance back of their cuttingedge to the tub to form radial slots 29 for automatically releasing any trash that may get between them. A narrow portion 31 of the edge of the turning disk may .be curved in a rearward direction to its concavity or reversely bowed as shown in 'Figs. 2 and 4, thereby providing a beveled peripheral edge which is self sharpening by continuous engagement with the face of the cutting disk and is more efficient in scraping the soil therefrom. A narrow pOItiOn 32 of the edge of the cutting disk may in like manner be curved in a rearward direction as shown in Fig. 2 for increasing its efliciency for use in hard dry soil by automatically retaining its proper depth therein.

In operation, the long shaft of the turning disk being journaled at its ends in the respective legs of the yoke, maintains the disk in the same plane in relation to the yoke and prevents it from getting out of line from wear as is so universally the case when the shaft is suppported at one end only and in a single bearing. By means of the yoke the turning disk therein may be adjusted on the bracket in different distance relations to the face of the cutting disk and also in different horizontal angles thereon.

The micrometer adjustment of the bracket on the standard, as shown in Figs. 2 and 5, serves to adjust the turning disk with its plane in different vertical angles and also in a plane substantially parallel to the adjacent portion of the face of the cutting disk. The adjustment of the standard on the stationary arm 8 together with its connections serves to raise or lower the turning disk parallel with the adjacent curved surface of the cutting disk. The resiliency of the sectional disk permits a longer portion of its edge to movably engage with the face of the cutting disk for removing the soil from a wider surface thereof and also for being partially self cleaning in the absence of the wire brush by reason of the relative movement Or vibration of its sections.

Having fully described my improvements, what I claim as my invention and desire to secure by Letters Patent of the United States is:

1. A soil turning disk comprising-a hub, and a disk made up of an annular series of segmental resilient sections secured to the hub, successive segments having their edges in mutual contact, the meeting edges of adjacent sections being provided with registered notches constituting radial clearance slots.

A soil turning disk provided with a central opening and a shaft extending through said opening, the shaft being provided at one end with a head, an annular shoulder spaced from the head and bearing against one side of the disk, the shaft being screw threaded at the opposite side of the disk and adjacent thereto, and a nut upon the threaded portion of the shaft and bearing against the adjacent side of the disk, that portion of the shaft between the head and the disk constituting a bearing portion,

and the opposite end portion of the shaft being smooth and constituting a bearing portion.

3. A soil turning attachment for disk plows, comprising a coneavo-convex disk formed of a series of radial sections of thin resilient metal secured together near their common center.

4. A soil turning disk formed of a series of radiating sections of thin resilient metal removably secured together near their common center and arranged with radial slots between their adjacent edges for the pur pose specified.

5. A concavo-convex soil. turning disk consisting of a series of radial sections of thin resilient metal removably secured together near their common center and formed with a narrow portion of their cutting edge curved in a rearward direction,

for the purpose specified.

6. The combination with a rotatable plow disk, of a soil turning disk provided with a beveled peripheral edge in cooperative rela tion. with the plow disk.

7. The combination with a rotatable plow disk of a concavo-eonvex soil turning disk having its outer peripheral edge portion reversely bowed and providing a beveled peripheral edge portion in cooperative rela tion with the plow disk.

. GEORGE L. HOFFMAN.

Witnesses:

REUBEN F. HOFFMAN, R. S. CARR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. G. 

